77970519 has 20 divisors (see below), whose sum is σ = 127064520. Its totient is φ = 47254320.

The previous prime is 77970493. The next prime is 77970559. The reversal of 77970519 is 91507977.

It is not a de Polignac number, because 77970519 - 2¹² = 77966423 is a prime.

It is a super-2 number, since 2×77970519² = 12158803666258722, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (77970559) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 42864 + ... + 44645.

It is an arithmetic number, because the mean of its divisors is an integer number (6353226).

Almost surely, 2^77970519 is an apocalyptic number.

77970519 is a deficient number, since it is larger than the sum of its proper divisors (49094001).

77970519 is a wasteful number, since it uses less digits than its factorization.

77970519 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 87532 (or 87523 counting only the distinct ones).

The product of its (nonzero) digits is 138915, while the sum is 45.

The square root of 77970519 is about 8830.0916756283. The cubic root of 77970519 is about 427.2120313649.

The spelling of 77970519 in words is "seventy-seven million, nine hundred seventy thousand, five hundred nineteen".